Liquefaction behavior using elemental shear test and dynamic response analysis during seismic events to assess liquefaction potential in reclaimed land

Abstract

Continuous monitoring of ground acceleration and pore water pressure took place at a site susceptible to liquefaction in the reclaimed land of the Tokyo Bay waterfront area. This location experienced extensive liquefaction during the 2011 off the Pacific Coast of Tohoku Earthquake. A survey of the site revealed a soil profile up to a depth of 17m. The installation site for the pore water pressure gauges and accelerometers exhibits a high content of fine particles, not only comprising sand but also significant quantities of silt and clay. Hollow torsional shear tests were conducted on the extracted soil to assess its resistance to liquefaction. Using these and other soil test outcomes, a three- dimensional dynamic response analysis using one- dimensional column model was performed based on the measured wave data. In the results of the element tests conducted in this study, it was found that the silty sand collected from the field site exhibits a significantly low liquefaction resistance. The analysis revealed that the excess pore water pressure tends to increase to some extent.